EnergyMech IRC bot installed on my server by "hacker

Well, I know a lot of people don't like to admit it, but I got "hacked" over the Xmas holidays, thanks to my own stupidity and oversight. Meaning, I wasn't really "hacked" in the clbuttical sense, and I got what I deserved by being stupid -- akin to leaving the car keys in the car and someone driving off with my car. (I flippantly created an account for a virtual stereo to play my MP3's and made the pbuttword the same as the username totally overlooking the fact that I had ssh open and port-forwarded to this machine... Du-uh!)

Fortunately, it looks like from the logs that all that happened was the person who "hacked" me installed an IRC bot called 'EnergyMech'. I've not found any root kits or any other exploits except this. Can someone fill me in on exactly what EnergyMech does or can do? From what I've read about EnergyMech, my reaction is "A person hacked into my computer to install THIS???" It looks pretty innoculous, save for some suggestions that EnergyMech was once used for hacking and 'evil purposes' (from the EnergyMech home page.) Can someone give me a better idea of the scope of this bot? It appears it was not used to actually do anything. I know what IRC is, but I'm not a big user of it and I'm not sure what an IRC bot does (or from what I've read, my reaction is "Big deal. So what!?")

Meanwhile, I think I've battioned down all the hatches. Really stupid on my part, so I got what I deserved.

-ceo